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126 .IX Title "Algorithm::DiffOld 3"
127 .TH Algorithm::DiffOld 3 "2006-07-31" "perl v5.8.7" "User Contributed Perl Documentation"
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133 Algorithm::DiffOld \- Compute `intelligent' differences between two files / lists
134 but use the old (<=0.59) interface.
137 This has been provided as part of the Algorithm::Diff package by Ned Konz.
138 This particular module is \fB\s-1ONLY\s0\fR for people who \fB\s-1HAVE\s0\fR to have the old
139 interface, which uses a comparison function rather than a key generating
142 Because each of the lines in one array have to be compared with each
143 of the lines in the other array, this does M*N comparisions. This can
144 be very slow. I clocked it at taking 18 times as long as the stock
145 version of Algorithm::Diff for a 4000\-line file. It will get worse
146 quadratically as array sizes increase.
148 .IX Header "SYNOPSIS"
150 \& use Algorithm::DiffOld qw(diff LCS traverse_sequences);
152 \& @lcs = LCS( \e@seq1, \e@seq2, $comparison_function );
154 \& $lcsref = LCS( \e@seq1, \e@seq2, $comparison_function );
156 \& @diffs = diff( \e@seq1, \e@seq2, $comparison_function );
158 \& traverse_sequences( \e@seq1, \e@seq2,
159 \& { MATCH => $callback,
160 \& DISCARD_A => $callback,
161 \& DISCARD_B => $callback,
163 \& $comparison_function );
165 .SH "COMPARISON FUNCTIONS"
166 .IX Header "COMPARISON FUNCTIONS"
167 Each of the main routines should be passed a comparison function. If you
168 aren't passing one in, \fBuse Algorithm::Diff instead\fR.
170 These functions should return a true value when two items should compare
176 \& @lcs = LCS( \e@seq1, \e@seq2, sub { my ($a, $b) = @_; $a eq $b } );
179 but if that is all you're doing with your comparison function, just use
180 Algorithm::Diff and let it do this (this is its default).
185 \& sub someFunkyComparisonFunction
191 \& @diffs = diff( \e@lines, \e@patterns, \e&someFunkyComparisonFunction );
194 which would allow you to diff an array \f(CW@lines\fR which consists of text
195 lines with an array \f(CW@patterns\fR which consists of regular expressions.
197 This is actually the reason I wrote this version \*(-- there is no way
198 to do this with a key generation function as in the stock Algorithm::Diff.